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<div style="font-family: Verdana; font-size: 12px; line-height: normal;">Dear All,</div>
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<div style="font-family: Verdana; font-size: 12px; line-height: normal;">I'm having a stange problem when attemping to connect to my Centos server using x2goclients (Ubuntu & mac, 4.0.5.0). I'm running firewalld, but port 22 is unblocked and I am able to ssh into the machine and forward X traffic. When accessing from both a mac and an ubuntu client the session appears to start, but then immediately disconnects. The client logs say:</div>
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<div style="font-family: Verdana; font-size: 12px; line-height: normal;">Info: Proxy running in client mode with pid '12054'.<br/>
Session: Starting session at 'Wed Aug 5 12:38:47 2015'.<br/>
Info: Using abstract X11 socket in kernel namespace for accessing DISPLAY=:0.<br/>
Info: Connecting to remote host 'localhost:31003'.<br/>
Info: Connection to remote proxy 'localhost:31003' established.<br/>
Error: The remote NX proxy closed the connection.<br/>
Error: Failure negotiating the session in stage '7'.<br/>
Error: Wrong version or invalid session authentication cookie.<br/>
Session: Terminating session at 'Wed Aug 5 12:38:53 2015'.<br/>
Session: Session terminated at 'Wed Aug 5 12:38:53 2015'.</div>
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<div style="font-family: Verdana; font-size: 12px; line-height: normal;">If I attempt to reconnect, I can see the session, but am unable to resume it. The strange thing is that if I stop firewalld, I'm able to access the server from both clients with no issues, which implies it's a firewall issue, but as I say port 22 is unblocked and I can forward X traffic. Is there some other obvious firewall setting I've failed do? Any assistance in fixing or diagnosing this issue would be highly appreciated.</div>
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<div style="font-family: Verdana; font-size: 12px; line-height: normal;">Many thanks,</div>
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<div style="font-family: Verdana; font-size: 12px; line-height: normal;">Will.</div>
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